Portable battery



FIG. 1 is a front perspective view of a portable battery showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a rear perspective view thereof.

The broken lines in the figures depict environmental subject matter and form no part of the claimed design. 

CLAIM We claim the ornamental design for a portable battery, as shown and described. 